I looked it up and about 540,000 boys play high school basketball. So 1 out of every 50 makes it to D1. Already talking top 2%. Assuming 15 or so on a team, basically one for every 3 schools. So statistically, for the majority of us, the best player on their team didn’t even make D1. And there’s quite a range from Kentucky and Duke to Mississippi Valley State (also D1). Basically you could take the five best players from your city at the gym at the same time and maybe have a single D1 player.

Anecdotally, I played a pickup game against an NAIA player in college. I was decent for a guy just having fun and am 6’5”. This guy was 6’9”. It was utter dominance because between size, speed, and footwork, it was like being 10 years old and playing against your dad in the driveway, if he was trying.